Photocopying – Projection printing and copying cameras – Detailed holder for original
Patent
1983-04-20
1985-05-21
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Detailed holder for original
355 50, 355 64, 355 76, G03B 2762
Patent
active
045182515
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for handling sheets (documents) for microfilming or other similar recording such as image digitalation and also for scanners and other readers reading alphanumeric characters or symbol codes. The apparatus includes in this respect a conveyor path fed step-by-step, a positioning portion on the conveyor for positioning a sheet one by one in flat state on the conveyor, an exposure table with plane surface arranged in the conveying direction after said positioning portion, and a microfilm camera or other equipment for digitalation or reading arranged above the exposure table.
It is extremely important for correct microfilming that the sheet will have exact position on the exposure table relative to the camera. Both upon manual positioning of the sheets and to a still more extent upon automatic positioning, it can be difficult to obtain a sufficient exactness for the position of the sheets on the exposure surface. Besides microfilming and image digitalation this is also valid for scanners and other readers which on a limited surface read characters or symbol codes. A non-correct positioning of sheets can besides carelessness depend on sheet defectives or on the positioning mechanism. The sheets can also lay irregularly in a sheet store.
In a known microfilming apparatus of above mentioned kind, in which the conveyor consists of an endless mat for conveying sheets to the exposure table, photocells and other sensors indicate that the sheets have desired position. Should this not be the case, the process is interrupted. Thus, non-correctly positioned sheets implies a disturbance in the production. If the disturbances are frequent, an automatic feeding can be made impossible. Moreover, such a position indication is comparatively complicated and expensive.
By the present invention the above mentioned problems have been solved with simple but yet always reliable means, which compared with said known apparatus also is accompanied by a considerable cheaper construction. The positioning of the sheets becomes in spite of the simple means always exact and therefore there are no need for position sensors.
The characteristics of the invention to achieve this appear from the following claims.
An embodiment of the invention is in the following described more in detail with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view somewhat schematically illustrating the embodiment of an apparatus according to the invention;
FIG. 2 is a top view of the apparatus showing a sheet store and sheet conveyor with sheet positioning portion and exposure table;
FIG. 3 is a top view showing the right part of the apparatus and also showing camera equipment and sheet turn device;
FIG. 4 illustrates a part of a section through the exposure table.
The apparatus according to the invention as shown consists in its main components of a sheet store 10, a sheet feeder mechanism 11, a conveyor path 12, a sheet turn mechanism 13 and a camera equipment 14. Although not shown, there are furthermore drive means and control systems for the various operations performed in the apparatus.
The store 10 is positioned at one end of the conveyor and includes a stack of sheets 15. The sheet feeder mechanism 11 is journalled above the store and consists of a sheet lifting arm 16, which by means of vacuum or suction lifts the top sheet in the sheet stack, and a sheet extractor arm 17, which sucks up a lifted sheet and draws the sheet out on the conveyor by reciprocating motion along a slide rod 18.
The conveyor path 12 consists of a positioning portion 19, on which the sheet extractor 17 lays in flat state a sheet drawn from the store 10, and an exposure table 20 arranged in the conveying direction after the positioning portion. A conveyor device consisting of endless parallel belts 21 (see FIG. 4) is arranged for feeding one sheet at the time to position on the exposure table. The belts are controlled fed step-by-step and are for this feed provided with rows of projecting drivers in the form of
REFERENCES:
patent: 2849916 (1958-09-01), Nolan
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